Central portion of a wheel hub



FIG. 1 is a perspective view from the front and left side of the central portion of a wheel hub according to our design; and,

FIG. 2 is a front elevational view thereof.

Throughout the Figures, broken lines showing structure are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a central portion of a wheel hub, as shown and described. 